carbomethoxylation of the Diels-Alder adduct of furan and maleic anhydride yielded the methyl all-exo-7-oxanorbornane-2,3,5,6-tetracarboxylate (7) which was transformed in three steps into 2,3,5,6-tetramethylidene-7-oxanorbornane (1), a useful synthon. Six isomeric methyl 7-oxanor-bornane-2,3,5,6-tetracarboxylates (7–12) have been isolated and their 1H- and 13C-NMR. data are compared.
呋喃和
顺丁烯二酸酐的Diels-Alder加合物经
钯催化的双碳甲氧基化反应,生成甲基全-exo -7-
恶烷硼烷-2,3,5,6-四
羧酸甲酯(7),将其分三步转化为2,3, 5,6-四亚甲基-7-氧杂
硼烷(1),一种有用的合成子。已分离出六种异构体7-氧杂
硼烷-2,3,5,6-四
羧酸甲酯(7-12),其1 H-和13 C-NMR。比较数据。